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Chemical Sources and Sinks of OCS in the Lower Atmosphere of Venus
Yuk L. YungM. C. Liang,
California Institute of [email protected]
EGU Meeting2008
Important Processes in the Atmosphere of Venus
• Catalytic Chemical Cycles
• Heterogeneous Chemistry
• Middle Atmosphere Circulation
• OCS as tracers of chemistry and dynamics
Venus model description
• Two-dimensional Caltech/JPL KINETICS chemical transport model
• Solve continuity equation for 24 species with ~200 chemical reactions (subset of Mills’)
Role of circulation
• Affect the upward flux of OCS from the surface
• Reduce OCS abundances at high latitudes
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S2 OCS
S3 S4S8
hv
S
S
hv
hv
hv
hv
CO
S4
S2
S
S3
S4
hv S
Conclusions
• Scale height of OCS cannot be explained by photolysis alone
• Photosensitized dissociation of OCS via polysulfur photochemistry
• Integrated destruction rate of OCS is 23,000 Tg- S/yr [Earth = 10 Tg-S/yr]
Acknowledgements
• NASA and ESA• P. Drossart• R. L. Shia• K. Baines• D. Crisp• C. Lee• X. Jiang • B. Bezard• E. Marq
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